メタデータ
| 項目 |
値 |
| Designation |
C/2000 J1 (Ferris) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-05-11T07:12:19.716480Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:04Z |
| Obs used |
24 |
| NEO |
- |
| M1 |
14.200 |
| K1 |
10.000 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2000-05-11.0000000 |
| e |
0.95426363 |
| q (au) |
2.542550 |
| a (au) |
55.591420 |
| i (deg) |
98.794665 |
| Ω (om, deg) |
28.440310 |
| ω (w, deg) |
147.219674 |
| M (ma, deg) |
359.999286 |
等級
散乱 + 全体線形
$$
M_a = (18.720 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
18.720 |
| n |
2.000 |
| gf |
0.998 |
| gb |
-0.872 |
| k |
0.800 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-09-20 00:00 |
03:51:38.40 |
-36:28:02.3 |
HIP 17982 |
12.49 |
| 2026-09-20 12:00 |
03:51:36.70 |
-36:28:33.7 |
HIP 17982 |
12.27 |
| 2026-09-21 00:00 |
03:51:34.97 |
-36:29:05.0 |
HIP 17982 |
12.08 |
| 2026-09-21 12:00 |
03:51:33.21 |
-36:29:36.2 |
HIP 17982 |
11.91 |
| 2026-09-22 00:00 |
03:51:31.43 |
-36:30:07.3 |
HIP 17982 |
11.76 |
| 2026-09-22 12:00 |
03:51:29.62 |
-36:30:38.3 |
HIP 17982 |
11.65 |
| 2026-09-23 00:00 |
03:51:27.79 |
-36:31:09.1 |
HIP 17982 |
11.56 |
| 2026-09-23 12:00 |
03:51:25.93 |
-36:31:39.9 |
HIP 17982 |
11.50 |
| 2026-09-24 00:00 |
03:51:24.05 |
-36:32:10.5 |
HIP 17982 |
11.46 |
| 2026-09-24 12:00 |
03:51:22.14 |
-36:32:41.1 |
HIP 17982 |
11.46 |
| 2026-09-25 00:00 |
03:51:20.20 |
-36:33:11.5 |
HIP 17982 |
11.49 |
| 2026-09-25 12:00 |
03:51:18.24 |
-36:33:41.8 |
HIP 17982 |
11.55 |
| 2026-09-26 00:00 |
03:51:16.26 |
-36:34:12.0 |
HIP 17982 |
11.64 |
| 2026-09-26 12:00 |
03:51:14.25 |
-36:34:42.0 |
HIP 17982 |
11.76 |
| 2026-09-27 00:00 |
03:51:12.21 |
-36:35:11.9 |
HIP 17982 |
11.91 |
| 2026-09-27 12:00 |
03:51:10.15 |
-36:35:41.7 |
HIP 17982 |
12.09 |
| 2026-09-28 00:00 |
03:51:08.06 |
-36:36:11.3 |
HIP 17982 |
12.29 |
| 2026-09-28 12:00 |
03:51:05.96 |
-36:36:40.9 |
HIP 17982 |
12.52 |
| 2026-09-29 00:00 |
03:51:03.82 |
-36:37:10.2 |
HIP 17982 |
12.77 |
| 2026-09-29 12:00 |
03:51:01.66 |
-36:37:39.5 |
HIP 17982 |
13.05 |
| 2026-09-30 00:00 |
03:50:59.48 |
-36:38:08.6 |
HIP 17982 |
13.35 |
| 2026-09-30 12:00 |
03:50:57.27 |
-36:38:37.5 |
HIP 17982 |
13.67 |
| 2026-10-01 00:00 |
03:50:55.04 |
-36:39:06.3 |
HIP 17982 |
14.02 |
| 2026-10-01 12:00 |
03:50:52.79 |
-36:39:35.0 |
HIP 17982 |
14.38 |
| 2026-10-02 00:00 |
03:50:50.51 |
-36:40:03.5 |
HIP 17982 |
14.75 |
| 2026-10-02 12:00 |
03:50:48.21 |
-36:40:31.8 |
HIP 17982 |
15.15 |
| 2026-10-03 00:00 |
03:50:45.88 |
-36:41:00.0 |
HIP 17982 |
15.55 |
| 2026-10-03 12:00 |
03:50:43.54 |
-36:41:28.1 |
HIP 17982 |
15.98 |
| 2026-10-04 00:00 |
03:50:41.16 |
-36:41:55.9 |
HIP 17982 |
16.41 |
| 2026-10-04 12:00 |
03:50:38.77 |
-36:42:23.6 |
HIP 17982 |
16.86 |
| 2026-10-05 00:00 |
03:50:36.35 |
-36:42:51.2 |
HIP 17982 |
17.32 |
| 2026-10-05 12:00 |
03:50:33.91 |
-36:43:18.6 |
HIP 17982 |
17.79 |
| 2026-10-06 00:00 |
03:50:31.45 |
-36:43:45.8 |
HIP 17982 |
18.27 |
| 2026-10-06 12:00 |
03:50:28.96 |
-36:44:12.8 |
HIP 17982 |
18.76 |
| 2026-10-07 00:00 |
03:50:26.45 |
-36:44:39.6 |
HIP 17982 |
19.25 |
| 2026-10-07 12:00 |
03:50:23.93 |
-36:45:06.3 |
HIP 17982 |
19.76 |
| 2026-10-08 00:00 |
03:50:21.37 |
-36:45:32.8 |
HIP 17982 |
20.27 |
| 2026-10-08 12:00 |
03:50:18.80 |
-36:45:59.1 |
HIP 17982 |
20.79 |
| 2026-10-09 00:00 |
03:50:16.21 |
-36:46:25.2 |
HIP 17982 |
21.32 |
| 2026-10-09 12:00 |
03:50:13.59 |
-36:46:51.1 |
HIP 17982 |
21.85 |
| 2026-10-10 00:00 |
03:50:10.95 |
-36:47:16.8 |
HIP 17982 |
22.39 |
| 2026-10-10 12:00 |
03:50:08.29 |
-36:47:42.3 |
HIP 17982 |
22.93 |
| 2026-10-11 00:00 |
03:50:05.61 |
-36:48:07.7 |
HIP 17982 |
23.48 |